Noun / Clause + こととて

[Because; since (excuse/archaic)]

Connection: Noun の / Plain form + こととて

Usage: A literary and somewhat archaic expression used to give a reason or excuse. Often implies an apology or justification for something that went wrong. Has a humble or deferential tone.

Nuance: More formal and old-fashioned than ので or から. Often used in apologies or when explaining extenuating circumstances.

Examples:

不慣れなこととて、ご迷惑をおかけして申し訳ございません。(Being inexperienced, I apologize for the inconvenience.)

急なこととて、十分な準備ができませんでした。(Since it was sudden, I was unable to prepare sufficiently.)

知らなかったこととて、大変失礼いたしました。(Since I didn't know, I was very rude — please forgive me.)